(boolean)
Juju on MAAS creates a juju-br0 bridge for deploying LXC and KVM
workloads. Enable this to remove this bridge if you want to install
vhost0 directly on the underlying interface.
WARNING: This will break current and future juju-deployed LXC or KVM
workloads on all machines where this is set to true.

(string)
Virtual gateways to create (software based).
Using a YAML encoded string specify one or more gateways using a list
of maps, where each map consists of the following attributes:
project - project name
network - network name
interface - interface to use (will be created)
subnets - list of virtual subnets to route
routes - list of routes gateway will make available to virtual subnets,
0.0.0.0/0 selects all routes
For example:
// make any network available to virtual subnet 10.0.10.0/24 on
// admin:public network using local interface vgw to route
[ { project: admin, network: public, interface: vgw, subnets: [ 10.0.10.0/24 ], routes: [ 0.0.0.0/0 ] } ]

Relations
Relations enable services to easily and securely share information with each other.